20-30-99
ALL ú ú 01 Page 201 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
~................................................................. | Final Cleaning of Composites Prior to Structural Bonding | | Table 201 | ................................................................... | | Material | Other | | Material Name | Bulk Code | Specifications | ................................................................... |Methyl Propyl Ketone (MPK) |B00666 | | |(High purity) | | | ................................................................... |Naphtha (Non-Metallic core only) |B00083 |TT-N-95 | 2...................................…...........….................1
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20-30-99
ALL ú ú 01 Page 202 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
STATIC GROUNDING - MAINTENANCE PRACTICES
________________________________________
1. General
_______
A. This procedure contains these tasks:
(1)
Static Ground procedure
(2)
Bonding procedure
(3)
Measure Airplane Electrical Resistance to Ground
B. Grounding (Static Grounding) is the process of connecting one or more metal objects and ground conductors to ground electrodes (an electrical path to earth).
(1) A positive ground is the same as a static ground.
C. Bonding is the process of connecting two or more metal objects together
with a conductor. ú D. Static grounding is not necessary if the airplane is parked for a ú turnaround flight and no maintenance is to be done. ú E. During normal pressure refueling the airplane:
(1) An electrical bond is necessary between the airplane and the
refueling vehicle. ú (2) Static grounding is not necessary as long as the conductivity of the ú airplane and the parking site is adequate (AMM task Measure Airplane ú Electrical Resistance to Ground within this procedure). ú (a) The operator should ensure the adequacy of airplane and parking ú area conductivity and may need to establish local procedures in ú areas where inadequate parking site conductivity is seasonal or ú permanent. ú (b) Parking site conductivity may be inadequate on dry snow, dry ú sand or in areas of low moisture. ú (3) During over wing refueling. ú (4) When performing maintenance task using following devices:
(a)
Power Tools
(b)
Electrical Power Sources
(c)
Lights
(d)
Powered Instruments
F. When static grounding is recommended in a detailed procedure, the airplane must be statically grounded to a common, approved, identified ground. Where a grid system is used, any number of individual grounds will provide a common ground, since all grounds are interconnected. If an area does not have a grid system, a single approved and identified ground must be used as the common ground for all grounding cables used.
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